/Engine/Source/Editor/CurveEditor/Public/ICurveEditorDragOperation.h
Implementation method for derived types to initialize a drag
virtual void OnInitialize ( [FCurveEditor](API\Editor\CurveEditor\FCurveEditor) * InCurveEditor, const [TOptional](API\Runtime\Core\IO\TOptional)< [FCurvePointHandle](API\Editor\CurveEditor\FCurvePointHandle) > & CardinalPoint )